🗄️ SQL Queries and DBMS

A complete collection of SQL queries and DBMS concepts for beginners to advanced learners.
This repository is designed to help students, developers, and interview aspirants master Database Management Systems (DBMS) and SQL efficiently.

---

📌 Features

• 📚 Well-structured DBMS notes
• 🧠 Important SQL queries (basic to advanced)
• ⚡ Real-world examples
• 🎯 Interview-focused questions
• 📝 Easy-to-understand explanations

---

📂 Repository Structure

---

📌 Folder Explanation

• basics/ → Beginner-level SQL (start here if new)
• queries/ → Most important queries for practice & interviews
• advanced/ → Real-world DBMS features
• notes/ → Theory for exams & interviews

---

🚀 Learning Path

1. Start with basics/
2. Move to queries/
3. Practice advanced/
4. Revise using notes/dbms_theory.md

---

🧑‍💻 Topics Covered

🔹 DBMS Concepts

• Database & DBMS Introduction
• ER Model
• Normalization
• Keys (Primary, Foreign, Candidate)
• Transactions & ACID Properties
• Indexing

🔹 SQL Commands

📌 DDL (Data Definition Language)

• CREATE
• ALTER
• DROP
• TRUNCATE

📌 DML (Data Manipulation Language)

• INSERT
• UPDATE
• DELETE

📌 DQL (Data Query Language)

• SELECT
• WHERE
• ORDER BY
• GROUP BY
• HAVING

📌 DCL (Data Control Language)

• GRANT
• REVOKE

📌 TCL (Transaction Control Language)

• COMMIT
• ROLLBACK
• SAVEPOINT

---

⚡ Sample Queries

-- Create Table
CREATE TABLE students (
    id INT PRIMARY KEY,
    name VARCHAR(50),
    age INT
);

-- Insert Data

INSERT INTO students VALUES (1, 'Rahul', 20);

-- Select Data
SELECT * FROM students;

-- Where Clause
SELECT * FROM students WHERE age > 18;
🚀 How to Use
Clone the repository
git clone https://github.com/your-username/sql-queries-and-dbms.git
Open SQL files in your preferred DBMS (MySQL, PostgreSQL, etc.)
Practice queries and modify them

🛠️ Tools Supported

MySQL
PostgreSQL
SQLite
Oracle

🎯 Who Is This For?

👨‍🎓 Students learning DBMS
💼 Interview preparation
👨‍💻 Beginner to intermediate developers
📊 Anyone interested in databases

🤝 Contributing

Contributions are welcome!
Feel free to fork this repo and submit a pull request.

⭐ Support

If you find this repository helpful, please ⭐ star it!

📧 Contact

Created by Ronit Raj
📌 Feel free to connect and collaborate!

📜 License

This project is open-source and available under the MIT License.

---

If you want next level 🚀  
I can:
- Add **50+ real interview SQL questions**
- Add **mini project (student DB / e-commerce DB)**
- Make this repo **stand out on your resume + LinkedIn**

Just tell me 👍
│
└── notes/
└── dbms_theory.md

Thank you🙌........